Different approach to standard lip seal required
A
Ceetak product story
Edited by the Engineeringtalk editorial team
Jun 14, 2001
When a manufacturer of hydraulic cylinders wanted to use a different type of tube to reduce costs, they turned to sealing specialist Ceetak to clarify the implications with regards to seal life
When a leading manufacturer of hydraulic cylinders wanted to use a different type of tube to substantially reduce costs, they turned to sealing specialist Ceetak Ltd to clarify the implications with regards to seal life.
With very severe design parameters requiring a stroke of nearly 1 metre and a cycle time of 8 seconds in a tube with an "as drawn" bore, it was recognised that a different approach to a standard lip seal was required.
To set a benchmark, tests were carried out back to back with two similar seals in polyurethane from alternative seal suppliers.
Temperature build up with all three seals was extreme due to poor dynamic lubrication conditions, and despite Ceetak's B7 seal outlasting the competition, all three eventually failed.
The failures were analysed, and it was found that the new tube had a poor surface finish and this was not allowing enough oil to lubricate between the seal and the metal tube, as in a normal honed tube, leading to a rapid temperature build up and premature failure.
To overcome this problem, and to allow the customer to proceed with their cost saving tube modification, Ceetak recommended using their "OK" profile seal.
The OK has a unique design incorporating a hard durable outer sealing ring, which is assembled into a small one-piece groove onto a square sectioned Nitrile ring.
This allowed for a compact leak free piston design.
The OK resists extrusion and shock loading, and will operate with large extrusion gaps up to 500-bar pressure and at a speed of up to 1m/sec.
Ceetak drew up a complete, but simple re-design of the piston.
Tests were carried.
These showed substantially reduced temperatures and better pressure response.
After completion of extensive tests, without failure, the cylinders were stripped down and again analysed.
The outcome was a complete success with no wear evident on the seal.
With Ceetak's help another engineered cost saving has been successfully implemented.
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